Can’t one of these ancient ruins be a fast food restaurant or casino? Why does everything have to be a temple of some sort?
Most of the time (and particularly during the Old Kingdom) the Egyptians used stone to build their important stuff such as tombs and temples, and used mud brick (sometimes on stone foundations, or on bedrock) to build their homes and other day to day structures. Near the Giza complex there are military-like parallel streets with a series of basically identical structures on each hand; the workforce needed to eat, obviously, and instead of (for example) building bigger ovens, they constructed a large number of “project” bakeries, of brick and stone.
The Middle Kingdom of Egypt was interesting in that it used mudbrick for most of its construction, with the occasional addition of Old Kingdom relief work and such, in stone, nabbed out of older, disused monuments.
Djedefre is little-known, which is weird to me; he succeeded Khufu, and was probably succeeded by his young son. Khafre, Djedefre’s brother (or half-brother) at some point (and by uncertain means) succeeded the nephew, who left very little behind. Khafre built the second largest Giza pyramid.
Menkaure was Khafre’s successor, and built the third largest (and a great deal smaller) Giza pyramid. Menkaure’s successor built a mastaba at Saqqara, my guess is, he lost control of Egypt, and ruled only part of it for a time.
......Why does everything have to be a temple of some sort?.....
Because astromerical archeology is not yet accepted by consensus to allow another interpretation